> In other words, the adversary in your threat model is the service provider - and in this case, Apple. And what good is that encryption, if Apple obviously can do almost anything with your device?
The adversary in this threat model isn't the service provider. The adversary is someone attacking the service provider, like a hacker or a government with a warrant, and getting access to Apple's storage of your data.
Now of course it's not impossible for such an adversary to also defeat other systems at Apple and get your data another way, for example by controlling Apple's ability to send over-the-air updates to Apple devices. But I think that is a sufficiently distinct threat that it's not worth dismissing solutions to the first threat. That would be like dismissing the importance of a web server storing passwords salted and hashed, since attackers could just use a totally different attack to bypass the web server's database access control. Another way to illustrate this might be to point out that attackers can physically coerce you to hand over data regardless of any security measures any service provider could possibly make, but that doesn't mean we should dismiss all such security measures.
The adversary in this threat model isn't the service provider. The adversary is someone attacking the service provider, like a hacker or a government with a warrant, and getting access to Apple's storage of your data.
Now of course it's not impossible for such an adversary to also defeat other systems at Apple and get your data another way, for example by controlling Apple's ability to send over-the-air updates to Apple devices. But I think that is a sufficiently distinct threat that it's not worth dismissing solutions to the first threat. That would be like dismissing the importance of a web server storing passwords salted and hashed, since attackers could just use a totally different attack to bypass the web server's database access control. Another way to illustrate this might be to point out that attackers can physically coerce you to hand over data regardless of any security measures any service provider could possibly make, but that doesn't mean we should dismiss all such security measures.